A novel heteroleptic iridium(III) acetylacetonate (acac) complex, (L-5-CHO)₂Ir(acac) (3b), was synthesised from 2-(9’-hexylcarbazole-3’-yl)-5-formylpyridine (L-5-CHO) (1b). The complex 3b was determined to be thermally and electrochemically stable. The photoluminescence properties of the compound were studied, with a dichloromethane solution of 3b giving structureless emission at 662 nm, showing that the formyl group red-shifted the emission by 151 nm compared to the parent complex. Complex 3b was also shown to possess a moderate photoluminescence quantum yield (67%) and a short emission lifetime (τ = 280 ns). Organic light-emitting diodes (OLEDs) were fabricated with a solution-processed emissive layer (EML) consisting of poly(N-vinylcarbazole) (PVK), 2-(4-tert-butylphenyl)-5-(4-biphenylyl)-1,3,4-oxadiazole (PBD) and iridium complex (3b). The OLEDs containing complex 3b showed red-orange electroluminescence (EL) at 624 nm. The influence of the host materials was studied and the best performance was achieved with both PVK and PBD in the emissive layer, with the resulting OLEDs exhibiting a current efficiency of 0.84 cd/A, a power efficiency of 0.20 lm/W, and an external quantum efficiency (EQE) of 0.66% at a brightness of 2548 cd/m².

由 2-(9'-己基咔唑-3'-基)-5-甲酰基吡啶合成了一种新型杂配基乙酰丙酮铱 (acac) 络合物 (L-5-CHO) ₂ Ir(acac) ( 3b ) ( L-5-CHO) ( 1b )。复合物3b被确定为热和电化学稳定。研究了化合物的光致发光特性，3b的二氯甲烷溶液在 662 nm 处产生无结构发射，表明与母体复合物相比，甲酰基使发射红移了 151 nm。复合体3b还显示出具有中等的光致发光量子产率（67%）和短的发射寿命（τ = 280 ns）。有机发光二极管 (OLED) 由溶液处理的发光层 (EML) 制成，该发光层由聚 (N-乙烯基咔唑) (PVK)、2-(4-叔丁基苯基)-5-(4-联苯基)- 1,3,4-恶二唑 (PBD) 和铱络合物 ( 3b )。含有配合物3b的 OLED在 624 nm 处显示红橙色电致发光 (EL)。研究了主体材料的影响，在发光层中使用 PVK 和 PBD 均实现了最佳性能，所得 OLED 的电流效率为 0.84 cd/A，功率效率为 0.20 lm/W，并且具有外部量子效率 (EQE) 为 0.66%，亮度为 2548 cd/m ²。